Cross-browser compatibility is a crucial aspect of web development that ensures websites and web applications work consistently across different browsers. It involves creating websites that can be accessed and used seamlessly on various browsers, such as Chrome, Firefox, Safari, and Internet Explorer.

Ensuring cross-browser compatibility is essential because different browsers interpret HTML, CSS, and JavaScript code in slightly different ways. This can lead to inconsistencies in how a website is displayed or functions on different browsers and versions.

For example, a CSS property that works perfectly in Chrome may not render correctly in Internet Explorer. Likewise, a JavaScript function that runs smoothly in Firefox may throw errors in Safari. These variations in rendering and functionality can result in a poor user experience and may cause users to switch to a different browser or abandon the website altogether. As a web developer, it is crucial to provide a consistent and seamless user experience across all popular browsers.

Embracing cross-browser compatibility helps expand your website's reach, ensuring it can be used by a wider audience, regardless of their preferred browser. By accounting for the differences in how browsers interpret code, you can create a more inclusive web experience for your users.